Hydraulic selective internal grinder



9 sheets-sheet 1 atto z um* Feb. 26, 1929,

A; P. sTElNER HYDRAULIC SELECTIVE INTERNAVGRINDER Filed April 27, V1925Fehzs, 1929,.

A.l=. sTElNER HYDRAULIC sELEc'rIvE INTERNAL GRINDEH Filed April 27, 19259 Sheets-sheet 2 gia/vanto@ @H561 Maj Feb. 26, 1929.

A. F?. STEINER HYDRAULIC sELEcTlvE INTERNAL GRINDER' Filed `April 27,1925 I 9 Sheets-Sheet 3 Feb. 26, 192,3. 1,703,794 A. P. STEINER'y YHYDRAULIC SELEGTIVE INTERNAL GRINDER Filedl April 27, '1925 9sheets-sheet' 4 gri/vento Feb. 26,` 1929. A y 1,703,794`

A. P. STEINER I HYDRAULIC SELECTIVE INTERNAL GRINDE@ Filed Aprn 27, 19259 vshtS- she'et .5

' INVENTOR mosp Steiner' BY' I I l ATTORNEY Feb. 26, 1929'. 1,703,794

A. P. sTElNER HYDRAULIC ssLEc'rvE INTERNALGRINDER Filed April 27, 1925 asheets-sheet-- e Feb. 26, 1929. l 1,703,794 A A. P. sTElNl-:RI f

HYDRAULIC SELECTIVE INTERNAL`GRINDE R Filed vApril 27, 1925 9sheets-'sneu v A. P. s'rElNER HYDRAULIC SELECTIVE INTERNAL GRINDER FebY262 1929.

F'led April 27, 1925 9 Sheets-Sheet 8 'mg/mma. I limos Reteznez.

Feb. 26, 1929. 1.703.794

A. P. STEINER HYDRAULIC SELECTIVE INTERNAL GRINDE R Filed April 27, 19259 Sheets-Sheet 9 j, '1 2' YV Y L\ In-v [n um H! S 15 Il U LL U AToRNEY.I

. Patented Feb.,26, 12929.

Amos P. STRINER, or WAYNEsRoRo,A PENNsY COMPANY, OFWAYNESBORO,PENNSYLVANIA HYDRAULIC sELEC'IIVE INTERNAL GRINDERQ' Application ledApril 27, 1925.Y Serial No. 26,232.

My saidinvention relates to agselective internal grinding machine and itislan object of thesame to provide an internal grinder in which eitherthe grinding wheel or the work may bfe caused to traverse relativelytothel` other.

Another object is to provide a part of veiy light weight for rapidi'eciprocation. The wheelvcarriageis comparatively small and of i lightweight, enabling .it to make more reciprocations with less power andvibrations,

for rapid grinding Qn sliortgworlgg Another object of the invention 1sto-provide means for moving the work supportv 5 rapidly to a distancefrom the wheel, as for changing work,`with means wherebythe rotation ofthe work is automatically stopped as it retreats from the-wheel andautomatically restarts as it approa'clie'sthe position of the wheel.

Another object of the invention is to pro` vide hydraulic operatingmeans for the traverse mechanism of the work carriageY and the wheelcarriage. A l

y A further object of the invention is to pro.- vide by one lever,mea'ns whereby the work, `the work carriage, and the wheel carriage maybe stopped and the pressure relieved from the whole system, therebysaving power. Referring' to the accompanying drawings which are made apart hereof and' on which similar reference characters indicate simi-larparts,

Figure 1 is a front elevation lof my machine in a preferred embodimentthereof,

- Figure 2, a similar view, on a larger scale, of the ,inlling"wlielcarriage and operating mechanism thereof,`

.Figure 3, a detail in plan of controlling mechanism for the motor of.the traverse means for the grinding wheeliarriage,

Figure 4, an end elevation of saidineans viewed from the right in Figure2,

Figure 5,21v plan viewpartly in section on line 5-5 of Figure 1 showingspeed changing mechanism for the work chuck spindle on the headstock. yFigure 6, a detail of the clutch operating mechanism and parts coactingtherewith, and

Figure 7, a detail of the clutch shifting levers seen from the right inFigures 1 and 5.

Figure 8 is an end elevation of the machine showing the relativelocation of the l various working parts,

' 55 Figure 9 is a plan view of the machine.

LvAN'IA,` Ass-IGNoR To LANDIs TooL ,A CORPORATION or PENNSYLVANIA.

Figure 10 is a` transverse sectionalrelevation through the plane ofoscillating motor.

rotation ofthe Figure 11 isa sectional plan View of thev valve mechanismof the motor for recipro- 60 eating the grinding wheel.

Figurel 12 is a sectional front elevation of said motor and valvemechanism. Y

Figure 13 is the saine as Fig. 12 with the valve and'pistonincorrespondingly different 65 positions.

Figure 14 is an end elevation of said motor in section.

Figure 15 is a front elevation including the work carriage and the partsvmounted on it. f.

In the drawings ,reference character 10 indicates a frame of anyconventional or to-and-fro. porting spindle or chuck-sh beveled gearsfrom The carriage bears a work sups0 aft 12 driven by a shaft 13rsimilarly 'driven from a shaft 14 whic vsliding movement through asprocket v15 h is mounted for driven by means hereinafter'described. A85 rear'eitension of the frame supports a carriage 16 adjust-able towardand from the work in any'desirable manner and held yieldably in itsforward position by a spring 17, Figure v4. A pulley 18 on this carriageis connected by a belt 19 to a wide-faced pulley 20 on a shaft having areduced portion 20 which carries a grinding wheel 22, the wide-facedpulley permitting the belt to travel back and forth with thereciprocating carriage 'for the 95 Urindin wheel or 'other abradiiigdevice.

he pu ey 18' is `on the saine shaft 21 .with a.

pulley 23 driven by a belt 423 which is driven directly or indirectlyfrom 'a pulley 24 0n the main shaft of the machine o 'convenient sourceof power.

r from anyother p A loose pulley 25 (Fig. 5) is driven by a beltl26'which may be Connected in any suitable manner with the main shaft orother source of power. shaft 27 and is formed at internally beveledflange 28 with an externally beveled 29 splined to the shaft,the ing aclutch for driving tb The pulley is loose on a one end with an adaptedto mate flange on a part two parts forine shaft from the iin y 34,thesprockets beingarranged in series of ulley. The clutch member 29iscontrolled y the lever 30 having forks 30 (Figs. 5 and 7j) engagingthe clutch member in any suita le manner. The lever is pivotedat 31 andthe clutch members are normally held in engage'ment with each other by aspring 32. A casing 33 (Figs. 1 and 5) covers the clutch, Said casinghaving a slot for lever 30.

Thev shaft 27 is connectedto a shaft 34-by speed 'varyingmeans'comprising a series of sprockets 35,36, 37, 38 on the shaft 27 anda series of sprockets 39, 40, 41, 42 on the shaft varying size on therespective shafts with the largest sprocket on one shaft opposite thesm'allest sprocket on the other shaft, and vice versa, and each pair ofsprockets is connected by a sprocket chain. The second series ofsprockets may be connected seriatimiothe shaft 34 on which they areloosely mounted for progressive speed variation by means of a slidablekey 43.pivoted at -44 on a spindle 45 and provided with a spring 46 toforce it into engagement with slots in the respective sprockets. Thespindle is arranged to be moved endwise by a lever 47 (Fig. 1) having atits free end a stop adapted to co-act with any one of ay series ofopenings in a segment 48. The lever is connected in any suitable manneras by links 49 and 50 to a yoke 51 on the spindle 45 and it will be seenthat by moving the .lever 47 any one of theseries o f sprockets 39, .40,41, 42 may have driving connection with the shaft 34. This shaft. isconnected by means of a sprocket 52 and a sprocket chain 53 to thesprocket 15 on lthe shaft 14. This gearing affords a very effective andrelatively silent speed-change mechanism for the ma- A chine of myinvention and 1s enclosedin a housing comprising a removable plate 54(Fig. 1) cooperating with the housing 33 to L enclose the clutch andthechange speed gearing.

The main shaft either directly or by convenient connections drives apump, indicated at 55, which communicates with a'tank 56, at the bottomof the frame 10 of the machine, and

is .so constructed as to receive all oil running down the inner' surfaceof said frame. The pump forces .fluid (preferably oil) through a pipe 56whichveommunic'ates with a pipe` 57 connected-to the relief valve 59Figure 6 vand leads back to the tankby a pipe 58. The

relief valve 59 holds the fluid at a constant predetermined pressure byadjusting the tension on the spr1ng`58 by means of the screw 59. An oilnot being used by the motorsl depresses t e spring and owsback to thetank through the pipe 58.

A pipe 62 leads from the main pipe 57 at the opposite side of the inletpipe 56 and communicates by means of a horizontal pipe 63 with the valvechamber of a hydraulic motor, the casing of which is indicated at 64while its operatingvane is indicated at 65. Valve mechanism of anydesirable form, e. g. an oscillatory or reciprocating reversing valvecontrolling oppositelj7 located outlets leading to opposite sides of thevane 65, located at the upper end of the casing controls the operationof the motor, this valve mechanism being controlled by a reversing lever66 which in turn is operated by dogs 66 land 67 on the traversing workcarriage said dogs having abutments 68 adapted frto strike against a lug69 fixed to rock with lever 66, Means for slowing the traverse of thework carriage as it approaches the ond of its movement in eitherdirection is. indicated at 67 comprising a lever operating a valve 68for reducing the flow of fluid to the motor. Cams 70 on the dogs areprovided with inclined faces to act on the free end of this lever. Thedogs vare adjustable toward and from each other in passes over anabutment 71 adapted to throw the lever to one -side or the other of itsmiddle position under certainconditions hereinafter described. The gear.wheel 12 is fixed tothe shaft ofthe fluid motor or driven yfrom saidshaft by suitable gearing.

Still another branch of the main pipe 57 leads, as shown at 72, to thefront side of a valve casing 73, Figs. 2 and 3, which casing isvprovided with a return pipe 7 4 at the rear leading to the tank 56. Thecasing contains a double ended valve 75, which Vconnects with a motorcasing 76 by means of a pair of passages 77 and 78. The motor casing isfixed by means of a bracket 80 (preferably integral with the motorcasing) to an arm 82 projecting forward from the adjustable carriage 16and integral therewith. The casing contains a piston 79 connected by a.rod 79 to the traversable grinding wheel carriage.

Av valve 72 in the pipe 72 provides means for vregulating the speed andcutting` off power' from the motor 76 of the wheel carriage and thusstopping the traverse of said vcarriage. The traversing wheel carriagehas V-shaped lateral extensions 81 Figure 4 moving 1n V-shaped guidegrooves on thearm 82.

' The forward one of said grooves is formed in a detachable side member83 held in place by screws 84 and spaced from the arm 82 by a pluralityof shims 85. When in the operation of themachine the guide grooves forthe V-shapedA extensions 81 become. worn, giving rise to unevenness orlooseness in the llO c vrock arm 94 rigidly connected to the arm 88,-

movement of the wheel carriage, such wear may be quickly taken up byremoving the screws 84 and the frame member 83, taking out one or moreof said shinis and replacing the parts, the V-shaped parts exerting asortl of wedging action on each other to take up .the wear and lift thewheel-carriage back to its proper level.

For controlling the operation of the motor o f the grinding wheelcarriage I have provided a post 86 yon the carriagev projecting lipinthe arm 82 above ward through a slot 86 'said carriage (Fig. 3) and ayoke 87 fast on said post with a pair of upwardly projecting armsadapted to engage a rock arm 88 pivoted at 89. The rock arm has aperforated head 90 through which a rod 91 passes, which rod isadjustably connected to the rock arm and forms an operating stein forthe valve 75. Screws -are provided at 92 in said upwardly projectingarms tor varying the point of impact of the yoke SPK-against the arm 88and thus varying-the length of the the wheel carriage as well as theposition of the carriage at each end of its stroke.' A spring-pressedabutment 93 has oppositely beveled faces bearing against a. roller on asaid abutment insuring that lthe arm will move past its central positioncarrying with it 'the motor controlling valve.

' For moving the clutch lever 30 .to throw.

the clutch 28, 29 intoand out of operation I have provided a lever 95-(Figs. 1 and 6) pivoted at 96 and provided with a cam 97 act-ing on 'aroller 98 carried by a yoke 99said-yoke being connected by a rod 100tothe clutch lever 30. A spring 101 is provided for moving the lever ina direction to permit the spring 32 (Fig. 5) to throw the clutch intooperation and a cam 102 is provided on the traversing work carriage formoving the lever in the opposite direction whereby the cam97 is made toact through the parts above enumeratedto throw the clutch positively out'of action and thereby stop the rotation of the chuck-shaft 12.

The yoke 99 carries another roller 103 coacting with'a cam 104 ixed to ahand lever 105 by which the operations of the machine may be controlledmanually. without regard to the'automatic controls described. A lever 61has on its upper side three -faces 106, 107,

108 hereinafter referred to for convenience as notches, with which therounded lateral projection or roller 109 on the lower end of the handlever coacts.

In the position indicated in the drawings the valve stem 60 has beendepressed, compressing the spring-and opening the valve-therebyreleasing the pressureL and permitting the -iluid to b v-pass back tothe tank without operating either ofthe mot-ors 64 and 79, alsoreleasing the pressure -to reduce the head on the oil pump 55. In thisthe chuck action and start shaft.

able abutment- 111 position also the high part of the cam 104 engagesroller 103 to throw t-he clutch 28, 29

.out of engagement and stopj the rotation of the work chuck spindle 12.

In the middle position of the lever-with its lug 109 in the notch 107the cam 104 is moved so far as to permit the clutch members 28 and 29 toengage to rotate the work chuck spindle but the valve 60 has not beenclosed so that the work carriage is not traversed. The rotation of thewheel being independent of the hydraulically-controlled means saidrotation will also continue at this time.

When tion where the lug 109 engages the potch 106 the clutch remains inengagement to rotate shaft and the valve 60 is closed to cause the flowof Huid through the various motors thereby bringing the motorsintooperation. In the machine as shown in the drawings the work carriagewill now move to the right until the Work comes into operative relationwith the wheel. Before this'occurs the cam 102 on the carriage will havereleased the lever 95' which lever otherwise holds the clutch out ofengagement while the work-carriage is in retracted position regardlessof the position of cam 104. `When this lever is released the spring 101swings it to the right and permits the clutch togo into TheI carriagenow continues its't-ravel toward the working position and 68""throws thereversing lever into its central)- position but in the presentembodiment of the invention the spring 110 is located on aI movinsteadof being held in a fixed position as in previous machines-and thisabutment is permittedtol move down soA exerts notension on the farthat-the spring abutment 71 so that the lever 66 'is not thrown past itscentral position andthe reversing mechanism for the work carriage is notoperated. When now the grinding operation on a specific piece eratorplaces his foot on a treadle-112 which acts through a link 113 andalever 114 to.

liftthe abutment 111 and through the spring forces the abutment-'71yieldingly against the roller on lever 66 which then is m'oved lpast thedead center whereby the carriage Areversing mechanism is returned toaction in a direction to move the Work carriage back to the positionshown in Figure 1. It has been explained that the excess of pressureluidwhichordinarily would drive the work carriage, will pass back throughthe by-pass against the yielding resistance of the valve 60 when themotor for the work carriage is out ofo eration.

I at any time it should be considered desirable to -reciprocate the workcarriage as in a case Where work of unusual length is to the hand leveris thrown to the posii from the pump to pass passages leading to the'.

-the rotation of: the chuck of workis completed the op- .taking placeunder power; carriage may tank. This 'be handled a'. hook 115 (Fig 1)pia-eredamie on the frame of'thevma'chine and normally held -in theposition 'indicated inthe drawings ma 4be moved by the operator to theleft under the reduced end of the lever 114. Said ,hookholds' the leverin position to force the spring 110 against the abutment 71 in a manffor the forward and backward movement respectively at thebeginning ofoperation of Such a piecey of work and at the end of such o eration;that the work carriage may be reclprocated while the, grinding wheelcarriage stands still; that the grinding wheel shaft andthe chuck shaftmay be rotated while' both carriages-are stopped, all said operationsand that the work b e traversed-manually` at will. It isv also feasibleto interrupt the drive for the grinding wheel independently of any ofthe other means, the connections from the source of power to the shaftof the grinding wheel for driving it'being independent of the 'F-4"other driving connections hereinbefore de- A feature of importancev inthe mechanism is that the oil-tank islocated at the bottom of the framewith exhaust pipes leading to it from the different motors and from thebypass valves. The `frame of the machine is closed for the most part sothatv any leakage, `will almost inevitably be drained back into the tankand not'be wasted onlth'e shop floor, thus eliminating waste and at thesame time keeping the oil off the iioor.' Furthermore all arts of thehydraulic mechanism containing packing, e. g. the pump and the motor forthe work-carriage, are directly above the. tank, so that all leakagewill pass to such feature is of course applicable to other machines asare various other featuresdescribed and claimed in this applica` tion.

Valves for the fluid motorsare located in the one instance entirelyabove the motor and in the other instance above the working parts of themotor." This avoids a difficulty that has been found in the art of iiuidmotors, particularly in connection' 'with grinding machinerywhichdiiiiculty arises out'of the fact that gas or'air or bothmay occurinthe motor, as by generation of gas when the oil becomes heated in thesystem and accumulates in the motors in a way to interfere with theirsatisfactory operation causing trembling andk irregularity in theoperation. By the present arrangement the air'or gas which naturallyrises to the highest level passes into the valve casing and thence isexhausted with the ex be recapitulated vhaust fluid so as to passv backinto the tank The ordinary operation of the machine may briefly asfollows:

With the parts in the position shown in Figure 1 fthe clutch controllingthe chuck shaft is out of action and power is cut off from the fluidmotors. The movement of the carriages may now be initiated (preferablyafter starting rotation'of the grinding wheel) by movingthe' hand lever105 in a clockwisev di- .rection until the detent 109 rests in the notch106 whereupon the wheel carriage will begin to reciprocate and 'the workcarriage will move to the right, the chuck shaft remaining idle untilthe cam incline 102 on the work carriage passes' the lever 95 whereuponthe springs 101 and 32 move the parts into driving relation with thechuck shaft and rotation of the shaft begins. The carriage continues tomove forward at a uniform speed until the left-handcam 7 0 strikes thefree end of the lever 67 and depresses it so as to slowdown the carriagemovement gradually byclosing the valve 69 slowly. y The abutment 68 nowstrikes the lever 66 and moves it into upright neutral positionwhereupon the carriage stops because of the interruption of the actionthe greatest certainty Fand exactitude.

of its motor. The grinding wheel now operates on the work for such alength-of time as may be' desired after which the operator places hisfoot onjthe treadle 112 and forces 'the abutment 71 upward to move thelever 66 past the dead center whereupon the action yof the motor isreversed and the carriage is moved towards the position shown inFigure 1. When it reaches thisposition a dog 68" on the carriage strikesthe lever 66 and moves it again to neutral position, the grindingy wheelcarriage still reciprocating and. the grinding wheel continuing torotate. The rotation of the chuck however, has been stoppedbecause ofthe engagement of the cam 102 and the lever 95. l

At'this time the lever 105 is inV its extreme right hand position. If itshould 'nowbe vdesired yto bring. the work carriage to the right fromthe position shown in Figure 1, without rotating the chuck shaft thelever 105 is movedlto its middle position with lug 109 in the middlenotch 107 whereupon thel fluid motors will move the carriages but thecam '104' 'will-bear against the roller 103 to hold the clutch of thechuck shaftpositively out of-operative position.

' If the lever is moved to the position shown in Fig. 1 the iiuidby-pass through the valve 5 9 is opened and both fluid motors remainstationary whereupon the carriages may be adjusted invarious respectsand moved -to ward and from'one another in a manner familiarto thoseskilled in the art, the rotation of the grinding wheel continuing unlessinterrupted by manipulation of parts not shown inthe drawings.

It will be obvious to those skilled in the art that theV device may bemodified'in many respects without departing from the spirit of thelnvention and therefore I do not limit myself to what is shown in thedrawings and described in the specification but only as in- ,callytraversing mounted work carriage,

dicated in the appended claims. An important feature of my invention isthe light weight wheel carriage which is adapted for veryrapidfrcciprocation throughout the en- -tire stroke or nearly so andbeing followed by a quick reversal in the direction of movement. This isimportant in that it makes for high speed ofoperation.

Having thus fully described my said invention what 1 claim as new anddesire to secure by Letters Patent is:

l. A grinding machine comprising a frame, a grinding wheel, meansforreciprosaid wheel, a reciprocably means for traversing said' carriagethrough a range beyond that of the reciprocating wheel'including a levermovable to control and reverse said traverse, means controlled by saidtraversing motion to move said lever and stop said traversing motion,and normally inoperative manually controlled means to further move saidlever to reverse the traversing motion, substantially as set forth.

2. A grinding machine comprising a frame,

a grinding wheel, Huid pressure means for reciprocally traversing YsaidWheel, a reciprocably mounted work carriage, means for traversing saidcarriage through a range beyond that of the reciprocating wheel`including av lever movable to control and reverse Saidvir my hand atWaynesboro,

traverse, means controlled by said traverse motion to move said leverand stop said traversing motion, and normally inoperative manuallycontrolled means to further move said lever to reverse the traversingmotion and means operative 4near the end of each traverse of thecarriage for slowing down the traversing motion, substantially as setforth.

3. lA- grinding machine having a bed or track and a work carriagereciprocable 1ongitudinallyv thereof and a carried by a shaftsubstantially parallel to said bed, a carriage movable transversely ofsaid bed' having an arm extending forward over said bed and upon whichthe grinding shaft is mounted so that it may be brought into line withthe travel of the work and may t1'L vel axially,- and means fortraversing said grinder shaft axially comprisin a digrinding wheelrectly connected Huid pressure cylin er and piston mounted on theforwardly extended arm, substantially as set forth. f

4. A grinding machine comprising a base', a work carriage reciprocablelongitudinally thereof, a grinding wheel base movable transversely ofthe base, base having an arm upwardly mountedwithin said extended arm, apiston within said cylinder, a grinding Wheel mounted upon said piston,fluid pressure means for reciprocating the said piston, and means foradjusting the range through which the saidpiston reciprocates, setforth.

Y In witness whereof, I

extending forwar ly and have hereunto'- 'set Pennsylvania, this 23d dayVof April, A. D. nineteen hundred.

and twenty-live.

' Y Amos P. STEINEB.

therefrom and having a cylinder.y

substantially as the said'grindin vwheel i

